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<h2 id="什么是webshell？"><a href="#什么是webshell？" class="headerlink" title="什么是webshell？"></a>什么是webshell？</h2><p>webshell就是以asp、php、jsp或者cgi等网页文件形式存在的一种代码执行环境，也可以将其称做为一种网页后门。<br>黑客在入侵了一个网站后，通常会将asp或php后门文件与网站服务器WEB目录下正常的网页文件混在一起，<br>然后就可以使用浏览器来访问asp或者php后门，得到一个命令执行环境，以达到控制网站服务器的目的。<br>顾名思义，“web”的含义是显然需要服务器开放web服务，“shell”的含义是取得对服务器某种程度上操作权限。<br>webshell常常被称为入侵者通过网站端口对网站服务器的某种程度上操作的权限。<br>由于webshell其大多是以动态脚本的形式出现，也有人称之为网站的后门工具。</p>
<p>web端使用Xterm.js或者其他的WebShell组件和WebSocket<br>后端只需要支持WebSocket和SSH协议的远程登录模块即可</p>
<h2 id="Web端shell的实现"><a href="#Web端shell的实现" class="headerlink" title="Web端shell的实现"></a>Web端shell的实现</h2><h3 id="客户端实现"><a href="#客户端实现" class="headerlink" title="客户端实现"></a>客户端实现</h3><p>安装xterm</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">cnpm install xterm@3.1.0 --save</span><br></pre></td></tr></table></figure>
<p>在使用界面导包</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//在线编程黑窗口导包</span></span><br><span class="line"><span class="keyword">import</span> &#123; Terminal &#125; <span class="keyword">from</span> <span class="string">&#x27;xterm&#x27;</span></span><br><span class="line"><span class="keyword">import</span> * <span class="keyword">as</span> attach <span class="keyword">from</span> <span class="string">&#x27;xterm/lib/addons/attach/attach&#x27;</span> <span class="comment">// 安装插件适，可以使用attach去添加</span></span><br><span class="line"><span class="keyword">import</span> * <span class="keyword">as</span> fit <span class="keyword">from</span> <span class="string">&#x27;xterm/lib/addons/fit/fit&#x27;</span> <span class="comment">// fit进行自适应大小的</span></span><br><span class="line">Terminal.applyAddon(attach) <span class="comment">// 添加插件</span></span><br><span class="line">Terminal.applyAddon(fit) <span class="comment">// 添加插件</span></span><br></pre></td></tr></table></figure>
<p>页面展示</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!--实现在线编程黑窗口--&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">&quot;terminal&quot;</span>&gt;</span></span><br><span class="line">                <span class="comment">&lt;!--黑窗口--&gt;</span></span><br><span class="line">            <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br></pre></td></tr></table></figure>
<p>需要定义一个term空值来接收创建的黑窗口对象</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> &#123;</span><br><span class="line">    <span class="function"><span class="title">data</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="keyword">return</span>&#123;           </span><br><span class="line">            term:<span class="literal">null</span>   <span class="comment">//在线编程黑窗口</span></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>进行数据操作</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 在线编程黑窗口</span></span><br><span class="line">        <span class="comment">// 获取到了div标签</span></span><br><span class="line">        <span class="keyword">let</span> terminalContainer = <span class="built_in">document</span>.getElementById(<span class="string">&#x27;terminal&#x27;</span>)</span><br><span class="line">        <span class="comment">// 初始化黑窗口对象</span></span><br><span class="line">        <span class="built_in">this</span>.term = <span class="keyword">new</span> Terminal(<span class="built_in">this</span>.terminal)</span><br><span class="line">        <span class="comment">// 打开这个对象</span></span><br><span class="line">        <span class="built_in">this</span>.term.open(terminalContainer)</span><br><span class="line">        <span class="keyword">new</span> WebSocket(<span class="string">&#x27;ws://127.0.0.1:8000/webssh/&#x27;</span>)</span><br><span class="line">        <span class="built_in">this</span>.terminalSocket = <span class="keyword">new</span> WebSocket(<span class="string">&#x27;ws://127.0.0.1:8000/webssh/&#x27;</span>)</span><br><span class="line">        <span class="built_in">this</span>.terminalSocket.onopen = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123; <span class="comment">// 连接成功触发该方法</span></span><br><span class="line">            <span class="built_in">console</span>.log(<span class="string">&#x27;websocket is Connected...&#x27;</span>)</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="built_in">this</span>.terminalSocket.onclose = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123; <span class="comment">// 连接关闭适触发的方法</span></span><br><span class="line">            <span class="built_in">console</span>.log(<span class="string">&#x27;websocket is Closed...&#x27;</span>)</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="built_in">this</span>.terminalSocket.onerror = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123; <span class="comment">// 连接出错触发的方法</span></span><br><span class="line">            <span class="built_in">console</span>.log(<span class="string">&#x27;damn Websocket is broken!&#x27;</span>)</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="built_in">this</span>.term.attach(<span class="built_in">this</span>.terminalSocket)   <span class="comment">//绑定xterm到ws流中</span></span><br></pre></td></tr></table></figure>
<h3 id="服务端实现"><a href="#服务端实现" class="headerlink" title="服务端实现"></a>服务端实现</h3><p>使用paramiko与服务器建立交互，先进行安装，还需要安装dwebsocket</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">pip install paramiko</span><br><span class="line">pip install dwebsocket</span><br></pre></td></tr></table></figure>
<p>路由配置</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">from</span> django.urls <span class="keyword">import</span> path</span><br><span class="line"><span class="keyword">from</span> .views <span class="keyword">import</span> *</span><br><span class="line"></span><br><span class="line">urlpatterns = [</span><br><span class="line">    path(<span class="string">&#x27;webssh/&#x27;</span>,webssh)</span><br><span class="line">]</span><br></pre></td></tr></table></figure>
<p><strong>django接收websocket</strong></p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">from</span> dwebsocket <span class="keyword">import</span> accept_websocket <span class="comment">#只允许连接web的视图</span></span><br><span class="line"><span class="comment">#完成一个响应websock的连接视图</span></span><br><span class="line"><span class="comment"># ws://127.0.0.1:8000/webssh/</span></span><br><span class="line"><span class="meta">@accept_websocket</span></span><br><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">webssh</span>(<span class="params">request</span>):</span></span><br><span class="line">    <span class="comment"># 1. 获取到连接对象</span></span><br><span class="line">    ws = request.websocket</span><br><span class="line">    <span class="keyword">while</span> <span class="number">1</span>:  <span class="comment"># 主线程: 只管发送</span></span><br><span class="line">      	<span class="comment"># 2. 阻塞ws接收发来的数据</span></span><br><span class="line">      	cmd = ws.wait()</span><br><span class="line">      	<span class="keyword">if</span> cmd:</span><br><span class="line">        		channel.send(cmd)  <span class="comment"># 发送到linux 去执行</span></span><br><span class="line">        <span class="keyword">else</span>:  <span class="comment"># 如果连接断开，那么cmd将会发一个空包</span></span><br><span class="line">          	<span class="keyword">break</span></span><br><span class="line">   	recv_thread.join()  <span class="comment"># 回收子线程</span></span><br><span class="line">   	ws.close()  <span class="comment"># 关闭ws连接</span></span><br></pre></td></tr></table></figure>
<p>将由django接收到的websocket数据发送到Linux中</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">make_ssh</span>(<span class="params">host, username, password, port=<span class="number">22</span></span>):</span></span><br><span class="line">    <span class="string">&quot;&quot;&quot;</span></span><br><span class="line"><span class="string">    :host 主机地址</span></span><br><span class="line"><span class="string">    :username 用户名，一般是root</span></span><br><span class="line"><span class="string">    :password 密码</span></span><br><span class="line"><span class="string">    :port ssh协议的端口,22</span></span><br><span class="line"><span class="string">    &quot;&quot;&quot;</span></span><br><span class="line">    <span class="comment"># 初始化一个ssh对象</span></span><br><span class="line">    sh = paramiko.SSHClient()</span><br><span class="line">    <span class="comment"># 设置对象连接密钥规则</span></span><br><span class="line">    sh.set_missing_host_key_policy(paramiko.AutoAddPolicy())</span><br><span class="line">    <span class="comment"># 连接</span></span><br><span class="line">    sh.connect(host, username=username, password=password)</span><br><span class="line">    <span class="comment"># 生成shell对象，把命令执行结果，模拟成一个终端的返回，带上花里胡哨的颜色</span></span><br><span class="line">    channle = sh.invoke_shell(term=<span class="string">&#x27;xterm&#x27;</span>)</span><br><span class="line">    <span class="keyword">return</span> channle</span><br></pre></td></tr></table></figure>
<p>因为发送命令和接收不能在一条线上执行,所以现在要开辟一个子线程，专注于接收返回的命令。<br>主线程，专注的用来去发送命令，编写子线程方法，接收命令。</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">recv_ssh_msg</span>(<span class="params">channle, ws</span>):</span></span><br><span class="line">    <span class="string">&#x27;&#x27;&#x27;</span></span><br><span class="line"><span class="string">        channle: 建立好的SSH连接通道</span></span><br><span class="line"><span class="string">        这个函数会不停的接收ssh通道返回的命令</span></span><br><span class="line"><span class="string">        返回到前端的ws套接字里</span></span><br><span class="line"><span class="string">    &#x27;&#x27;&#x27;</span></span><br><span class="line">    <span class="comment"># 判断shell连接对象是否没有退出</span></span><br><span class="line">    <span class="keyword">while</span> <span class="keyword">not</span> channle.exit_status_ready():</span><br><span class="line">      	<span class="comment"># 接收过程可能会因为没有任何返回而报错</span></span><br><span class="line">        <span class="keyword">try</span>:</span><br><span class="line">            buf = channle.recv(<span class="number">1024</span>) <span class="comment"># 接收命令的执行结果</span></span><br><span class="line">            ws.send(buf) <span class="comment"># 向Websocket通道返回</span></span><br><span class="line">        <span class="comment"># 接收不到会报错，但是报错没关系，继续重新尝试接受</span></span><br><span class="line">        <span class="keyword">except</span>:</span><br><span class="line">            <span class="keyword">break</span></span><br></pre></td></tr></table></figure>
      
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            <a href="/blog1/2021/05/13/mysql%E5%AE%9E%E7%8E%B0%E8%AF%BB%E5%86%99%E5%88%86%E7%A6%BB(%E5%9C%A8%E4%B8%BB%E4%BB%8E%E5%90%8C%E6%AD%A5%E5%9F%BA%E7%A1%80%E4%B8%8A)/">mysql实现读写分离</a>
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            <a href="/blog1/2021/05/12/%E5%9C%A8%E9%A1%B9%E7%9B%AE%E4%B8%AD%E8%87%AA%E5%8A%A8%E7%94%9F%E6%88%90%E6%8E%A5%E5%8F%A3%E6%96%87%E6%A1%A3/">在项目中自动生成接口文档</a>
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            <a href="/blog1/2021/05/12/mysql%E5%AE%9E%E7%8E%B0%E4%B8%BB%E4%BB%8E%E5%90%8C%E6%AD%A5/">mysql实现主从同步</a>
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            <a href="/blog1/2021/05/09/CentOS%E9%83%A8%E7%BD%B2flask%E9%A1%B9%E7%9B%AE/">nginx部署flask项目</a>
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